func configureIface(ifname string, ipn ip.IP4Net, mtu int) error {
iface, err := netlink.LinkByName(ifname)
if err != nil {
return fmt.Errorf("failed to lookup interface %v", ifname)
}
err = netlink.AddrAdd(iface, &netlink.Addr{ipn.ToIPNet(), ""})
if err != nil {
return fmt.Errorf("failed to add IP address %v to %v: %v", ipn.String(), ifname, err)
}
err = netlink.LinkSetMTU(iface, mtu)
if err != nil {
return fmt.Errorf("failed to set MTU for %v: %v", ifname, err)
}
err = netlink.LinkSetUp(iface)
if err != nil {
return fmt.Errorf("failed to set interface %v to UP state: %v", ifname, err)
}
// explicitly add a route since there might be a route for a subnet already
// installed by Docker and then it won't get auto added
err = netlink.RouteAdd(&netlink.Route{
LinkIndex: iface.Attrs().Index,
Scope: netlink.SCOPE_UNIVERSE,
Dst: ipn.Network().ToIPNet(),
})
if err != nil && err != syscall.EEXIST {
return fmt.Errorf("Failed to add route (%v -> %v): %v", ipn.Network().String(), ifname, err)
}
return nil
}
func (rb *HostgwBackend) handleSubnetEvents(batch subnet.EventBatch) {
for _, evt := range batch {
switch evt.Type {
case subnet.SubnetAdded:
log.Infof("Subnet added: %v via %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP)
if evt.Lease.Attrs.BackendType != "host-gw" {
log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
continue
}
route := netlink.Route{
Dst: evt.Lease.Network.ToIPNet(),
Gw: evt.Lease.Attrs.PublicIP.ToIP(),
LinkIndex: rb.extIface.Index,
}
if err := netlink.RouteAdd(&route); err != nil {
log.Errorf("Error adding route to %v via %v: %v", evt.Lease.Network, evt.Lease.Attrs.PublicIP, err)
continue
}
case subnet.SubnetRemoved:
log.Info("Subnet removed: ", evt.Lease.Network)
if evt.Lease.Attrs.BackendType != "host-gw" {
log.Warningf("Ignoring non-host-gw subnet: type=%v", evt.Lease.Attrs.BackendType)
continue
}
route := netlink.Route{
Dst: evt.Lease.Network.ToIPNet(),
Gw: evt.Lease.Attrs.PublicIP.ToIP(),
LinkIndex: rb.extIface.Index,
}
if err := netlink.RouteDel(&route); err != nil {
log.Errorf("Error deleting route to %v: %v", evt.Lease.Network, err)
continue
}
default:
log.Error("Internal error: unknown event type: ", int(evt.Type))
}
}
}